<template>
  <div class="list" ref="wrapper">
    <div>
      <div class="area">
        <div class="title border-topbottom">当前城市</div>
        <div class="button-list">
          <div class="button-wrap">
            <div class="button">{{this.currentCity}}</div>
          </div>
        </div>
      </div>
      <div class="area">
        <div class="title border-topbottom">热门城市</div>
        <div class="button-list" >
          <div 
            class="button-wrap" 
            v-for="item in hotCities" 
            :key="item.id"
            @click="handleCityClick(item.name)">
            <div class="button">{{item.name}}</div>
          </div>
        </div>
      </div>
      <div class="area" v-for="(item,key) in cities" :key="key" :ref="key">
        <div class="title border-topbottom">{{key}}</div>
        <div class="item-list">
          <div 
            class="item border-bottom" 
            v-for="innerItem in item" 
            :key="innerItem.id"
            @click="handleCityClick(innerItem.name)">
            {{innerItem.name}}</div>
          </div>
      </div>
    </div>
  </div>
</template>

<script>
//导入城市名称滚动插件
import BScroll from 'better-scroll'
//导入计算属性以返回 Vuex store 中的状态的API和组件方法提交API
import {mapState,mapMutations} from 'vuex'

export default {
  data(){
    return{
    }
  },
  props:{
    cities:Object,
    hotCities:Array,
    letter:String
  },
  computed:{
    ...mapState({
      currentCity:'city'
    })
  },
  methods:{
    handleCityClick(city){//点击时分发被点击的热门城市
      //this.$store.dispatch('changeCity',city)
      //this.$store.commit('getChangeCity',city)
      this.getChangeCity(city)
      this.$router.push('/')
    },
    ...mapMutations(['getChangeCity'])
  },
  mounted(){
    this.scroll=new BScroll(this.$refs.wrapper) 
  },
  watch:{
    letter(){
      if(this.letter) {
        const element=this.$refs[this.letter][0]
        this.scroll.scrollToElement(element)
      }
    }
  }
}
</script>

<style lang="stylus" scoped>
  @import '~styles/varibles.styl'
  .border-topbottom
    &:before
      border-color:#ccc;
    &:after
      border-color:#ccc;
  .border-bottom
    &:before
      border-color:#ccc;
  .list
    overflow :hidden;
    position :absolute;
    top:1.78rem;
    left:0;
    right:0;
    bottom:0;
    .title
      line-height:0.54rem;
      background-color :#eee;
      padding-left :0.2rem;
      color:#666;
      font-size :0.26rem;
    .button-list
      overflow :hidden;
      padding :0.1rem 0.6rem 0.1rem 0.1rem;
      .button-wrap 
        float :left;
        width :33.3%;
        .button
          margin:0.1rem;
          padding :0.1rem 0;
          text-align :center;
          border:0.02rem solid #ccc;
          border-radius:0.06rem;
    .item-list
      .item
        line-height :0.76rem;
        padding-left:0.2rem; 
</style>